vovnet39， 1070 640*640 batch 1 15ms
最多 batch 4 130ms
import time
import torch
import torch.nn as nn
import torch.nn.functional as F
from collections import OrderedDict
__all__ = ['VoVNet', 'vovnet27_slim', 'vovnet39', 'vovnet57']
model_urls = {
'vovnet39': 'https://dl.dropbox.com/s/1lnzsgnixd8gjra/vovnet39_torchvision.pth?dl=1',
'vovnet57': 'https://dl.dropbox.com/s/6bfu9gstbwfw31m/vovnet57_torchvision.pth?dl=1'
}
def conv3x3(in_channels, out_channels, module_name, postfix,
stride=1, groups=1, kernel_size=3, padding=1):
"""3x3 convolution with padding"""
return [
('{}_{}/conv'.format(module_name, postfix),
nn.Conv2d(in_channels, out_channels,
kernel_size=kernel_size,
stride=stride,
padding=padding,
groups=groups,
bias=False)),
('{}_{}/norm'.format(module_name, postfix),
nn.BatchNorm2d(out_channels)),
('{}_{}/relu'.format(module_name, postfix),
nn.ReLU(inplace=True)),
]
def conv1x1(in_channels, out_channels, module_name, postfix,
stride=1, groups=1, kernel_size=1, padding=0):
"""1x1 convolution"""
return [
('{}_{}/conv'.format(module_name, postfix),
nn.Conv2d(in_channels, out_channels,
kernel_size=kernel_size,
stride=stride,
padding=padding,
groups=groups,
bias=False)),
('{}_{}/norm'.format(module_name, postfix),
nn.BatchNorm2d(out_channels)),
('{}_{}/relu'.format(module_name, postfix),
nn.ReLU(inplace=True)),
]
class _OSA_module(nn.Module):
def __init__(self,
in_ch,
stage_ch,
concat_ch,
layer_per_block,
module_name,
identity=False):
super(_OSA_module, self).__init__()
self.identity = identity
self.layers = nn.ModuleList()
in_channel = in_ch
for i in range(layer_per_block):
self.layers.append(nn.Sequential(
OrderedDict(conv3x3(in_channel, stage_ch, module_name, i))))
in_channel = stage_ch
# feature aggregation
in_channel = in_ch + layer_per_block * stage_ch
self.concat = nn.Sequential(
OrderedDict(conv1x1(in_channel, concat_ch, module_name, 'concat')))
def forward(self, x):
identity_feat = x
output = []
output.append(x)
for layer in self.layers:
x = layer(x)
output.append(x)
x = torch.cat(output, dim=1)
xt = self.concat(x)
if self.identity:
xt = xt + identity_feat
return xt
class _OSA_stage(nn.Sequential):
def __init__(self,
in_ch,
stage_ch,
concat_ch,
block_per_stage,
layer_per_block,
stage_num):
super(_OSA_stage, self).__init__()
if not stage_num == 2:
self.add_module('Pooling',
nn.MaxPool2d(kernel_size=3, stride=2, ceil_mode=True))
module_name = f'OSA{stage_num}_1'
self.add_module(module_name,
_OSA_module(in_ch,
stage_ch,
concat_ch,
layer_per_block,
module_name))
for i in range(block_per_stage-1):
module_name = f'OSA{stage_num}_{i+2}'
self.add_module(module_name,
_OSA_module(concat_ch,
stage_ch,
concat_ch,
layer_per_block,
module_name,
identity=True))
class VoVNet(nn.Module):
def __init__(self,
config_stage_ch,
config_concat_ch,
block_per_stage,
layer_per_block,
num_classes=1000):
super(VoVNet, self).__init__()
# Stem module
stem = conv3x3(3, 64, 'stem', '1', 2)
stem += conv3x3(64, 64, 'stem', '2', 1)
stem += conv3x3(64, 128, 'stem', '3', 2)
self.add_module('stem', nn.Sequential(OrderedDict(stem)))
stem_out_ch = [128]
in_ch_list = stem_out_ch + config_concat_ch[:-1]
self.stage_names = []
for i in range(4): #num_stages
name = 'stage%d' % (i+2)
self.stage_names.append(name)
self.add_module(name,
_OSA_stage(in_ch_list[i],
config_stage_ch[i],
config_concat_ch[i],
block_per_stage[i],
layer_per_block,
i+2))
self.classifier = nn.Linear(config_concat_ch[-1], num_classes)
for m in self.modules():
if isinstance(m, nn.Conv2d):
nn.init.kaiming_normal_(m.weight)
elif isinstance(m, (nn.BatchNorm2d, nn.GroupNorm)):
nn.init.constant_(m.weight, 1)
nn.init.constant_(m.bias, 0)
elif isinstance(m, nn.Linear):
nn.init.constant_(m.bias, 0)
def forward(self, x):
x = self.stem(x)
for name in self.stage_names:
x = getattr(self, name)(x)
x = F.adaptive_avg_pool2d(x, (1, 1)).view(x.size(0), -1)
x = self.classifier(x)
return x
def _vovnet(arch,
config_stage_ch,
config_concat_ch,
block_per_stage,
layer_per_block,
pretrained,
progress,
**kwargs):
model = VoVNet(config_stage_ch, config_concat_ch,
block_per_stage, layer_per_block,
**kwargs)
if pretrained:
state_dict = load_state_dict_from_url(model_urls[arch],
progress=progress)
model.load_state_dict(state_dict)
return model
def vovnet57(pretrained=False, progress=True, **kwargs):
r"""Constructs a VoVNet-57 model as described in
`"An Energy and GPU-Computation Efficient Backbone Networks"
<https://arxiv.org/abs/1904.09730>`_.
Args:
pretrained (bool): If True, returns a model pre-trained on ImageNet
progress (bool): If True, displays a progress bar of the download to stderr
"""
return _vovnet('vovnet57', [128, 160, 192, 224], [256, 512, 768, 1024],
[1,1,4,3], 5, pretrained, progress, **kwargs)
def vovnet39(pretrained=False, progress=True, **kwargs):
r"""Constructs a VoVNet-39 model as described in
`"An Energy and GPU-Computation Efficient Backbone Networks"
<https://arxiv.org/abs/1904.09730>`_.
Args:
pretrained (bool): If True, returns a model pre-trained on ImageNet
progress (bool): If True, displays a progress bar of the download to stderr
"""
return _vovnet('vovnet39', [128, 160, 192, 224], [256, 512, 768, 1024],
[1,1,2,2], 5, pretrained, progress, **kwargs)
def vovnet27_slim(pretrained=False, progress=True, **kwargs):
r"""Constructs a VoVNet-39 model as described in
`"An Energy and GPU-Computation Efficient Backbone Networks"
<https://arxiv.org/abs/1904.09730>`_.
Args:
pretrained (bool): If True, returns a model pre-trained on ImageNet
progress (bool): If True, displays a progress bar of the download to stderr
"""
return _vovnet('vovnet27_slim', [64, 80, 96, 112], [128, 256, 384, 512],
[1,1,1,1], 5, pretrained, progress, **kwargs)
if __name__ == '__main__':
model=vovnet39().cuda()
torch.save(model.state_dict(), f'bagnet9.pth')
inputs = torch.randn(1, 3, 640, 640).cuda()
for i in range(5):
start = time.time()
output = model(inputs)
print('output.size ', time.time() - start)#, output[0].size(), output[1].size(), output[2].size())